NoClassDefFoundError：無法初始化類sun.awt.X11GraphicsEnvironment

我想使用simplecaptcha-1.2.1.jar。它拋出異常。 rt.jar有sun.awt.X11GraphicsEnvironment類。 simplecaptcha-1.2.1.jar在Windows平臺（Server Weblogic）上工作正常。NoClassDefFoundError：無法初始化類sun.awt.X11GraphicsEnvironment

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Class.java:169) 
    at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68) 
    at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1135) 
    at nl.captcha.text.renderer.DefaultWordRenderer.render(DefaultWordRenderer.java:53) 
    at nl.captcha.Captcha$Builder.addText(Captcha.java:136) 
    at nl.captcha.Captcha$Builder.addText(Captcha.java:121) 
    at nl.captcha.Captcha$Builder.addText(Captcha.java:111) 
    at nl.captcha.servlet.SimpleCaptchaServlet.doGet(Unknown Source) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:697) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) 
    at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277) 
    at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556) 
    at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)

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